Mechanism for drawing patterns.



E. H. MUMPORD. MECHANISM FOR DRAWING PATTERNS. APPLIOATION FILED APR. 23. 1910.

1,075',1 1 7, Patented Oct. 7, 1913.

BNVENTOR WITNESSES UNIE sie ra il l I l I 4 E t L 1 MECHANISM FOR DRAWING PATTERNS.

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To all whom it may concern Be it known that I, EDGAR H. MUMFORD, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in hiechanism for Drawing Patterns, of which the following is a specification.

My invention has reference to mechanisms for drawing patterns from sand molds, and it has for its primary objects; the provision of an improved mechanism for drawing patterns whereby the pattern is held steady during the drawing; the provision of im t proved mechanism wherein the pattern is held steady by brace means supported from the drawing mechanism; and the provision of a simple and inexpensive drawing rig which will effectively hold the pattern against tilting movement during the drawing operation. These and such other ob jects as may hereinafter appear, or are incidental to my invention, I attain by means of a device illustrated in preferred form in the accompanying drawings, wherein,

Figure 1 is a side elevation of a drawing mechanism embodying my invention, and

Figure 2 is a side elevation of a slightly modified form of my invention.

Referring to the drawings, it will be seen that I have shown my improved drawing mechanism applied to a pattern plate 5, of usual construction, which is provided with a guide means 6 of any desired type. My invention is designed to steady the pattern plate during the drawing operation, and to this end I provide a drawing member 7, preferably composed of a head 7 and a chain or other member 8, preferably flexible, which is provided with a hook 9 for attachment to a pattern lifting screw or other suitable connection 10. Pivoted' to the head 7 are three legs or rods, 11, 12 and 13, which have their ends resting on the pattern plate pointed. This arrangement constitutes in effect a tripod brace or steady member, and when the slack of the chain 8 is being taken up, the pivoted legs of the tripod will drag over the pattern plate, and position themselves thereon when the chain or drawing member is taut, the pointed ends of the legs biting into the pattern plate. It will be seen that there is thereby provided an effective steady means for the pattern during the drawing operation, inasmuch as there can be no tilting movement of Specification of Letters Patent.

Application filed April 23, 1910.

Patented Oct. 7,1913.

Serial No. 557,108.

the pattern plate, follow board or pattern extension, to any of which the pattern may be attached for the ramming of the mold.

In Figure 2, I have shown the tripod brace mechanism slidaloly mounted on a rod 13, which is provided with an eye at each end to receive the crane or hoist hook, and the chain 8. In this arrangement the legs of the tripod are preferably positioned in caps or sockets in the pattern plate in the manner indicated, the stress of drawing being taken by the rod 13. It is, of course, to be understood that this construction, if desirable, may be used in the same manner as that of Figure 1.

My construction is simple and inexpensive and provides an elfective means for holding the pattern plate, and thereby the pattern, steady during the drawing, and it is obvious that the legs of the tripod brace can readily be adjusted and positioned ac cording to the character of the work to be done, and with improved results. My device is designed for use on pattern plates, or the equivalents thereof, namely follow boards, and pattern extensions in such cases as where the use of a pattern plate per se is impracticable, and it is understood that the term pattern plate used in the claims is intended to cover any such means for securing the pattern, and it is likewise understood that the term flexible drawing member is intended to cover any member which performs the function of the member 8. Other advantages of my construction will be apparent to those skilled in the art.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the following:

1. In a device for drawing patterns, a flexible lifting member adapted to draw the pattern, and means cooperating therewith as the flexible member becomes taut for transferring the center of oscillation of such flexible member from its point of at tachment to the pattern to a point higher up, whereby all of the said lifting member below such higher point becomes a part of a rigid pattern carrier.

2. The combination with a pattern plate of a flexible lifting member therefor and brace means supported thereon and adapted to engage the pattern plate at a plurality of points removed from the point of attachment of the lifting member.

3. A device for drawing patterns coinprlslng a flexible member, and a pluralityof brace rods arranged thereabout and pivoted near their intersection therewith, said to be attached to the pattern plate and a; plurality of brace rods arranged thereabout v and pivoted near their intersection therewith, the said rods being positioned when the drawing member is taut and holding the pattern plate against tilting movement.

In testimony whereof I have hereunto 15 signed my name in the presence of the two subscribed Witnesses.

EDGAR H. MUMroiin. Witnesses:

D. N. YEOKLEY, Gr. Gr. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

